Air purification device



FIG. 1 is a right, top perspective view of an air purification device;

FIG. 2 is a plan view of the front thereof;

FIG. 3 is a plan view of the left side thereof;

FIG. 4 is a plan view of the right side thereof;

FIG. 5 is a plan view of the top thereof; and,

FIG. 6 is a plan view of the rear thereof. 

The ornamental design for an air purification device, as shown and described. 